Danielle's Carlsbad Caverns Light

carlsbad_caverns.ino

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN          6
#define NUMPIXELS    8

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  pixels.begin();
  pixels.show();
}

// Starting off with multiple colors
int offset = 96;
void loop() {
  int wait = 100;
  int colorSteps = 256;
  
  if(offset > colorSteps) {
    // Turn off after an hour
    colorWipe(pixels.Color(0, 0, 0));
  } else {
    rainbow(wait, colorSteps, offset);
    offset++;
  }
}

// Set all the pixels to a certain color
void colorWipe(uint32_t color) {
  for(int i = 0; i < pixels.numPixels(); i++) {
    pixels.setPixelColor(i, color);
    pixels.show();
  }
}

// Rainbow cycles pixel 1 and 8 in a rainbow pattern
// pixel 8 advances one additional color step per cycle
// so that all colors may be displayed together at least once
// every 256 loops.
// Every loop takes 25.6 seconds with all loops taking 34.6 minutes to complete
void rainbow(int wait, int colorSteps, int secondPixelOffset) {
  int currentColor = 0;
  int colorRange = 65536;
  
  for(int pixelHue = 0; pixelHue < colorRange; pixelHue += colorSteps) {
    pixels.setPixelColor(0, pixels.gamma32(pixels.ColorHSV(pixelHue)));
    int secondPixelHue = pixelHue + (secondPixelOffset * colorRange / colorSteps);
    pixels.setPixelColor(pixels.numPixels() - 1, pixels.gamma32(pixels.ColorHSV(secondPixelHue)));
    pixels.show(); // Update pixels with new contents
    delay(wait);
  }
}